[Elecraft] K-3 Ref Cal adjustment affected 400 hz 8 pole filter

[kz5d at aol.com]

Performed the Reference Oscillator adjustment using Method 2. Discovered I was about 20 hz below 10.000. Got the adjustment completed and then noticed that when going from the 1khz bandwith to 400 hz filter the signal would drop down considerably. Opened Config menu and verified Filter 3 (400hz 8 pole) was turned On. Noticed that Filter FRQ was at zero. By adjusting the frequency to +0.25 it then seemed to perform as it had prior to the Reference Oscillator adjustment. Is this expected behavior?

Thanks in advance for the input. 

73,

Art KZ5D